-LRB- CNN -RRB- -- Bristol County , Massachusetts , prosecutors have dropped charges against an 18-year-old man accused of raping a 17-year-old girl in July at a Keith Urban concert south of Boston .

`` Given the state of the evidence , the case was dismissed in the interest of justice , '' said Gregg Miliote , a spokesman for the Bristol County district attorney .

Sean Murphy was charged with rape after an incident that happened in front of a large crowd on the lawn of the Xfinity Center , an outdoor amphitheater in Mansfield , Massachusetts , on July 26 .

Multiple people recorded what happened on their cell phones and provided video to authorities for their investigation .

Murphy entered a not guilty plea in court and was released on $ 10,000 bond .

His attorney had always maintained his client 's innocence .

`` Put simply , this was a consensual act , not a sexual assault , '' lawyer Steven Brooks said at the time . `` This was a private act that regrettably occurred in a public place . ''

`` Mr. Murphy deeply regrets this incident and I am sure the young woman does as well . The young woman was neither intoxicated nor overcome by drugs at the time . Mr. Murphy has no criminal history whatsoever . ''

Fans hospitalized after ` nutso ' Keith Urban concert

About 18,000 people attended the concert in Mansfield , about 30 miles south of Boston .

More than 20 people were hospitalized after the concert , police said . Another 50 were taken into protective custody , and several others were arrested over `` alcohol-related issues , '' local authorities said .

`` In total , fire and EMS attended to 46 medicals resulting in 22 transports mostly alcohol-related , '' Mansfield Police Chief Ron Sellon and Fire Chief Neal Boldrighini said in a joint statement . `` Police dealt with a steady stream of intoxicated persons as well , resulting in over 50 people being taken into protective custody and a number of others arrested for alcohol-related issues . ''

CNN 's Alan Duke , Mayra Cuevas , Todd Leopold and Cristy Lenz contributed to this report .

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The suspect 's lawyer says it `` was a consensual act , not a sexual assault ''

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The incident happened in front of a large crowd on the Xfinity Center lawn

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People recorded what happened on their cell phones and provided video to authorities

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`` This was a private act that regrettably occurred in a public place , '' attorney says